"Jesus overturning the moneychangers' tables has nothing to do with iconoclasm, in any of its foul instances."
It illustrates that there is a time and place to cleanse the temple, so to speak. (Now if you could guarantee that everything catholics ever did was totally in line with the will of God then you might be able to argue that your temple was never in need of cleansing.)
Iconoclasm is not now, and never has been, an instance of such cleansing. Indeed, if I may revise my statement, the results of protestant iconoclasm infiltrating the Catholic Church are an example of the temple pollution that needs to be cleansed. Iconoclasm is ultimately a celebration of ugliness; a rejection of the beauty of God and His creation. If that's what you want, knock yourself out. But don't pretend to be Christian when you're doing it.
This is the same type of argument Leftists use against America.
Now if you could guarantee that everything Americans ever did was totally in line with the Declaration of Independence and the Constitution, blah, blah, blah...